CM Punk Pulled From Upcoming Comic Con Appearance

We reported earlier here at WrestlingNewsWorld.com that Daniel Bryan is scheduled to appear at Comic Con in Nashville next month. It looks like he'll be replacing CM Punk, who was pulled from the appearance. The following is from Punk's Twitter:

I know nothing about not being at @WizardWorld in Nashville. As far as I know, I'm still going to be there. Getting to the bottom of it...